<html lang='en'>
<head>
    <meta charset='UTF-8'>
    <meta http-equiv='X-UA-Compatible' content='IE=edge'>
    <meta name='viewport' content='width=device-width, initial-scale=1.0'>
    <title>ref</title>
    <script src='./vue.global.js'></script>
</head>
<body>
    <div id='app'>
        <base-input ref="bi"></base-input>
    </div>
    <script>
        const app = Vue.createApp({
            data(){
                return {}
            },
            methods:{},
            computed:{},
            mounted(){
                this.$refs.bi.focusTheFuckingInput()
            }
        })
        app.component("base-input",{
            template:`<input ref="ip">`,
            methods:{
                focusTheFuckingInput(){
                    this.$refs.ip.focus()
                }
            },
        })
        app.mount('#app')
    </script>
</body>
</html>